body {
    font-family: Arial, sans-serif;
}

header {
    background-color: #20b928;
    color: white;
    padding: 1em;
    text-align: center;
}

img {
    max-width: 400px;
    height: 150px;
    width: 150px;
}

nav ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: #333;

}
div{
    display: flex;
    margin-right: 20px;
}

nav li {
    float: left;
}

nav li a {
    display: block;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
}

nav li a:hover {
    background-color: #111;
}

main {
    padding: 20px;
    margin-bottom: 20px;
}

footer {
    background-color: #333;
    color: white;
    padding: 1em;
    text-align: center;
}